Blade-shrouding for steam-turbines.



C. A. PARSONS, S. S. COOK & L. M. DOUGLAS. BLADE SHROUIDING FOR STEAM TURBINES. APPucmoN FILED MAR. I. 1911..

1,276,405; Patented M920, 1918.

2 SHEETS--5HEET I.

W. WM

Fig.9. E 110.

Inventor;

charlcaflfaraons, Stan 6. Cook; t

c. A. PARSONS, s. s. COOK & L. m. noueu s.

I [BLADE SHRUUDING FOR STEAM TURBINES- AFPUCATIOI HLED IIAI. I. 19H 1,276,405. Patented Aug. 20, 1918.

2 SHEETS-SHEET 2.

Inventor: Charles Afaraom,

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UNITED sTA'res PATENT OFFICE.

CHARLES A LGEBNON PARSONS, STANLEY SMITH COOK, AND LOUIS MORTIMER DOUGLAS, 01 WALLSEND, ENGLAND; SAID COOK. All!) SAID DOUGLAS ASSIGN- 038 TO SAID PARSONS.

nLADE-eHRoUDme non STEAM-TURBINES.

V Great Britain and Ireland, residing at Turbinia :Works, Wallsend-on-Tyue, in the county of North'umberland, England, have 1 clin'v ledeerta-in neWand useful. Improved Bladershi'oud i n'gs for SteauFTurhines, of

which" the""following specilieati'ol'i.

The present invention relates to blade fshroudin'g for steam turbines and has for 'objeet to construct this shrouding and at" ta'chit" to the blades in such a manner that freedom forexpansion ofthe section of the shrouding is allowed for while all riveting or ealking' for fixing' the shroi'uliug is diswith.

Referrin'gio the accompanying drawings: Figure lis an end elevation for a blade wiugie shroud shown in section. i

F g. 2 is aside elevation of several blades with theshroud' attiiched, while Fig; 3 is a plan of severalblades with the shroud in position.

{showsthe end view ofla blade mm for. shrouding, while i 5 is a section onthe line 5-5, Fig. 1. l'fi'shows tlie sections of shrouds ready t r 1 'nsertion, hi e i 519,1- 10,11;, 19., raved 14,- Show tive inethods of making the joints at ythe endsof the section of shroud strip.

enue blades instead of rectangular 17 shows eircl'ilar neeks.

18 isan example-of the shroud applie to bledeswith diverging radial pas: S& S.

i j, Irv the form illustrated in Figs. 1 to 7, the shroud is made up of short sections, the

width of the shroud being split 1ongtlfdinally into two symmetrical pieces; a, b 0, c are cut on the inner edge of each half of the shroud as illustrated clearly Fig. 6. Notches d, d, are also out on the two sldesof each blade e close to their ends as shown clearly in Figs. 1- and 5. The split shroud is then assembled on, the blade ends as shown at Figs. .2 and 3, the notches inthe blades allowing the two-parts of the shroud-"tobe brought together in their corit erect-position. The whole is then fastened Specification of Letters Patent.

1115 i d 16- h w diamond-shaped1 Patented Aug. 20, 1918.

Application med. March 1,.191-7. Serial No. 151.501.

together by soldering the shroud. to the blades and neferably by soldering together the longitudinal edges of the two parts of the shroluls. We use the term soldering herein in its ernnmen meaning of securing the parts "together by the use of another metal as flux. the iiaresent invention relating espeolally to turbines of the type new gen orally used. in which thebiedes and shroud are made of brass; or similar non-corrosive metal with a steel rotor and casing and with suehhrass blades and shroud We preferably use silver solder. We prefer to make the shroud strips in short lengths, whieha're quite free from each other, so as'to provide for unequal expansion. This provision is important where the blades and shroud are mode of brass or similar material, having a different co-ezlieient of expansion from the v rotor or casing, espeeiallywhen liable to be sold d to the'higli temperatures of Super: been or higlipiiessure steai nl. The ends of" the .tions, of the shroud may be ofthe V-ehape i'orm. shown. in Fig. 7.01 of either of the forms shown iii Figs. 8, 9 and 10. We prefer. however. the method of jointing shown in Fig. 7 in which the sections attached to the blade frlurr no mutant with the sections attached to the blade 9', so that freedom for expansion of the sections is allowed. i

Figs. 11, 12, and 14' show two other methods of dividing the shroudwhile still retaining t-liereetangular neck on the blades.

Figs. 15 and 16 show an example in which the blades have diamoudshaFed uecks, suitable grooves to fit'these nee;

the shrouds.

Fig. 17 shows a modification in which the necks of the blades are .circuler; while Fig;

s being. cut in comprisingin eombinationtui'biiie blades,

oppositely disposed notches toward theends of said blades, a longitudinally divided shroud strip, notches in said shroud stri the two arts, of said stri being dis ose Oneech side of said blades msaidnotc es-in' S d i aid shrouding being.

against nor attached .of said blades,

con iprising rigidly to the blades constructed in sections the ends of adjacent sections not abutting to each other and not abuttin against nor attached to the blades to whic l the adjacent sections are attached. 2. Blade shrouding for steam turbines in combination turbine blades, oppositely disposed notches toward the ends a longitudinally divided shroud strip, notches in said shroud strip the two parts of said strip being disposed on each side .of said blades in said notches in said blades, said shrouding being soldered to the blades and constructed in sections, the ends of adjacent sections not abutting against nor attached to each other and not abutting against nor attached to the blades to which the adjacent sections are soldered.

3. Blade shrouding for steam turbines comprising in combination turbineblades, oppositely disposed notches toward the ends of said blades, a longitudinally divided shroud strip, notches in said shroud strip the two parts of said strip being disposed on each side of said blades in said notches in said blades, said shrouding being soldered to said blades.

i. Bliade shrquding for steam' turbines comprising in combination turbine blades, oppositely disposed notches near the outwardly projected ends of said blades, a shroud strip divided into several circumferential len' the or sections each 1011 itudinally divid into two half sections with the longitudinal division edges shaped to ,fit around said blades in way of said notches, said shroud strip being soldered to the blades and the half sections of said strip being disposed on opposite sides of said blades in said notches and the ends of adjacent sections not abutting a ainst nor attached to each other and not a utting'against nor attached to the blades to which'the adjacent sections are soldered.

Blade shrouding- I h rising in combination turbine-blades, oppositelv disposed notches near the outpairs in said notches, each pair bei for steam turbines \vardly projected ends 'of said blades, 9, shroud strip longitudinall divided into two half sections with the on 'tudinal division edges shaped to fit arou n said blades in way of said notches, the half sections of said strip being disposed on opposite sides of said blades in said notches said shrouding beingBsoldered to said blades.

lade shroudingfor steam turbines comprising in combination turbine blades, oppositely disposed notches near the outwardly projected ends of said blades, a shroud strip divided into several circumferential lengths or sections, each lon itudinally divided into two half sections with the longitudinal division edges shaped to fit around said blades in Way of the said notches, the half sections of said strip being disposed on opposite sides of said blades in said notchesfsaid shroudin being soldered along the longitudinal joints and also soldered to said blades.

7; Blade shrouding for steam turbines comprising in combination turbine blades, oppositely disposed notches near the outwardly projected ends of said blades, a

shroud strip divided into several 'circumfen ential lengths --or sections, each longitudidivided into two half sections with nall the i ongitudinal division edges shaped to fit around said blades in Way of said notches, the half-sections of said strip being disposed on opposite sides of said blades in said notches, said half sections being placed in PP siltely disposed and soldered to eac other a ondere to said lades, the ends of the sections not abutting against nor attached to the ends of adjacent sect-ions and not abuttin against nor atta hed to the blades to which the adjacentsec ions are soldered.

the ion 'tudinal division and also sol-' In testimony whereof. We have aflixed our signatures,

oaintns ALGIBNON masons. smarter sm'ni 000x.

LOUIS moanuntouetis. 

